WO2023032062A1 - Pneumatique - Google Patents

Pneumatique Download PDF

Info

Publication number
WO2023032062A1
WO2023032062A1 PCT/JP2021/032035 JP2021032035W WO2023032062A1 WO 2023032062 A1 WO2023032062 A1 WO 2023032062A1 JP 2021032035 W JP2021032035 W JP 2021032035W WO 2023032062 A1 WO2023032062 A1 WO 2023032062A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber composition
tire
pneumatic tire
tire according
mass
Prior art date
Application number
PCT/JP2021/032035
Other languages
English (en)
Japanese (ja)
Inventor
健二 ▲濱▼村
郭葵 河合
昴 遠矢
Original Assignee
住友ゴム工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友ゴム工業株式会社 filed Critical 住友ゴム工業株式会社
Priority to EP21955952.3A priority Critical patent/EP4382315A1/fr
Priority to PCT/JP2021/032035 priority patent/WO2023032062A1/fr
Priority to CN202180101784.5A priority patent/CN117858809A/zh
Publication of WO2023032062A1 publication Critical patent/WO2023032062A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C3/00—Tyres characterised by the transverse section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C3/00—Tyres characterised by the transverse section
    • B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • the present invention relates to pneumatic tires.
  • the fuel efficiency of a tire can be evaluated by its rolling resistance, and it is known that the lower the rolling resistance, the better the fuel efficiency of the tire.
  • Patent Documents 1 to 4 it has been proposed to reduce the rolling resistance by devising the shape of the tire and the compounding of the rubber composition that constitutes the tread portion of the tire.
  • the tire manufactured by the above-described conventional technology may have cracks at the bottom (groove bottom) of the grooves (circumferential grooves and lateral grooves) formed in the tread, and even though the tire has sufficient durability. do not have.
  • an object of the present invention is to provide a pneumatic tire with sufficiently improved crack resistance and durability.
  • a pneumatic tire having a tread portion with grooves formed on the surface,
  • the tread portion is formed with a first rubber composition forming a groove bottom portion and a second rubber composition adjacent to the first rubber composition inside the groove bottom portion in the tire radial direction.
  • E1-E2 acetone-extractable content of the first rubber composition
  • E2% by mass
  • (E1-E2) ⁇ 20 Assume that the cross-sectional width of the tire is Wt (mm), the outer diameter is Dt (mm), and the volume of the space occupied by the tire is virtual volume V (mm 3 ) when the tire is assembled on a regular rim and the internal pressure is 250 kPa.
  • a pneumatic tire characterized by satisfying (Equation 1) and (Equation 2). 1700 ⁇ (Dt 2 ⁇ /4)/Wt ⁇ 2827.4 (Formula 1) [(V+1.5 ⁇ 10 7 )/Wt] ⁇ 2.88 ⁇ 10 5 (Formula 2)
  • the invention according to claim 5 The loss tangent (0°C tan ⁇ ) of the first rubber composition measured under conditions of temperature of 0°C, frequency of 10 Hz, initial strain of 10%, and dynamic strain rate of 2.5% is 0.72 or more.
  • the invention according to claim 7, The pneumatic tire according to any one of claims 1 to 6, characterized in that the aspect ratio is 40% or more.
  • the invention according to claim 8 The pneumatic tire according to claim 7, characterized in that the aspect ratio is 45% or more.
  • the invention according to claim 9, The pneumatic tire according to claim 8, characterized in that the aspect ratio is 47.5% or more.
  • the tread portion has a plurality of circumferential grooves extending continuously in the tire circumferential direction,
  • the tread portion has a plurality of lateral grooves extending in the axial direction of the tire,
  • the pneumatic tire according to any one of claims 1 to 13, wherein the total volume of the plurality of lateral grooves is 2.0 to 5.0% of the volume of the tread portion. is.
  • the invention according to claim 18, The thickness Gd ( 18.
  • the invention according to claim 19 The pneumatic tire according to claim 18, wherein the 0°C tan ⁇ /Gd is 0.14 or less.
  • a tire according to the present invention has a tread portion having grooves formed on the surface thereof, and the tread portion includes a first rubber composition forming a groove bottom portion and a second rubber composition radially inside the groove bottom portion. It is characterized by being formed with one rubber composition and an adjacent second rubber composition.
  • the tire according to the present invention is mounted on a regular rim, the cross-sectional width of the tire when the internal pressure is 250 kPa is Wt (mm), the outer diameter is Dt (mm), and the volume of the space occupied by the tire is the virtual volume V (mm 3 ), it is characterized by satisfying the following (formula 1) and (formula 2). 1700 ⁇ (Dt 2 ⁇ /4)/Wt ⁇ 2827.4 (Formula 1) [(V+1.5 ⁇ 10 7 )/Wt] ⁇ 2.88 ⁇ 10 5 (Formula 2)
  • the "regular rim” is a rim defined for each tire by the standard in the standard system including the standard on which the tire is based.
  • ETRTO The European Tire and Rim Technical Organization
  • TRA The Tier and Rim Association, Inc.
  • Design Rim described in "YEAR BOOK”.
  • the smallest rim diameter among rims that can be assembled and can maintain internal pressure that is, rims that do not cause air leakage from between the rim and the tire, followed by the rim Indicates the narrowest width.
  • the tire outer diameter Dt is the tire outer diameter when the tire is mounted on a regular rim and the internal pressure is set to 250 kPa with no load applied.
  • the tire cross-sectional width Wt is the tire mounted on the regular rim.
  • the linear distance between the sidewalls (the total width of the tire), which includes all the patterns and letters on the tire side, excludes the patterns and letters on the tire side. width.
  • the virtual volume V (mm 3 ) of the tire is, specifically, the outer diameter Dt (mm) of the tire when the tire is mounted on a regular rim and the internal pressure is set to 250 kPa and no load is applied.
  • the cross-sectional height (distance from the bottom of the bead to the outermost surface of the tread, 1/2 of the difference between the outer diameter of the tire and the nominal rim diameter) Ht (mm) and the cross-sectional width of the tire Wt (mm) can be obtained by the following formula.
  • V [(Dt/2) 2 ⁇ (Dt/2) ⁇ Ht ⁇ 2 ] ⁇ Wt
  • the imaginary volume V (mm 3 ) and cross-sectional width Wt (mm) of the tire are further defined as [(V+1.5 ⁇ 10 7 )/Wt] ⁇ 2.88 ⁇ 10 5 (Formula 2) to satisfy you.
  • grooves refer to all grooves provided on the tread surface, such as circumferential grooves and lateral grooves.
  • the tire according to the present invention includes a first rubber composition forming the groove bottom portion and a first rubber composition inside the groove bottom portion in the tire radial direction. and a second rubber composition adjacent to each other, the acetone extractable content E1% by mass of the first rubber composition and the acetone extractable content E2% by mass of the second rubber composition and there is a relationship of (E1-E2) ⁇ 20.
  • This acetone extractable content can be considered as an indicator of the amount of easily migratable components such as softeners in the rubber composition. If the difference (E1-E2) in the acetone extractable content (AE amount) between the first rubber composition and the second rubber composition becomes small, regardless of the type of rubber composition, the first rubber composition The migration of components that easily migrate to the second rubber composition is reduced. That is, it is believed that by reducing (E1-E2) to less than 20, migration of a softening agent or the like to the bottom of the groove is suppressed regardless of the type of rubber composition, thereby suppressing the occurrence of cracks.
  • the difference in acetone extractable content (AE amount) between the first rubber composition and the second rubber composition is preferably (E1-E2) ⁇ 19, more preferably (E1-E2) ⁇ 18. and more preferably (E1-E2) ⁇ 17.
  • the lower limit of (E1-E2) is not particularly limited, but usually (E1-E2)>-40.
  • the acetone extractable content of the rubber composition can be measured according to JIS K 6229:2015 (extraction time: 10 hours).
  • the contact surface of the tread portion is preferably made of the first rubber composition having the same composition as that of the groove bottom portion.
  • the specific AE amount in the first rubber composition and the second rubber composition is the above (E1-E2) ⁇ 20, preferably (E1-E2) ⁇ 19, more preferably (E1- E2) ⁇ 18, more preferably (E1 ⁇ E2) ⁇ 17 is not particularly limited, but both E1 and E2 are 0 or more, preferably 3 or more, and more preferably 5 or more. Both E1 and E2 are usually 40 or less, preferably 37 or less, and more preferably 35 or less.
  • the tire according to the present invention preferably has an aspect ratio of 40% or more. As a result, it is possible to increase the area of the side portion, which improves the heat dissipation of the entire tire, suppresses the decrease in rigidity in the tread portion and the side portion, and improves the durability of the tire. be done.
  • the aspect ratio (%) described above can be obtained by the following formula using the cross-sectional height Ht (mm) and the cross-sectional width Wt (mm) of the tire when the internal pressure is 250 kPa. (Ht/Wt) x 100 (%)
  • the oblateness is more preferably 45% or more, and even more preferably 47.5% or more. It is more preferably 50% or more, particularly preferably 52.5% or more, and most preferably 55% or more. Although there is no particular upper limit, it is, for example, 100% or less.
  • the AE amount is an index indicating the amount of a component that easily migrates, such as a softening agent, among the components in the rubber composition.
  • the tire according to the present invention has circumferential grooves extending continuously in the tire circumferential direction in the tread portion, and the width of the circumferential grooves with respect to the groove width L0 of the circumferential grooves on the ground contact surface of the tread portion.
  • the ratio of the groove width L 80 at 80% of the maximum depth (L 80 /L 0 ) is preferably 0.3 to 0.7. As a result, it is possible to suppress the movement of the entire land portion at the bottom surface of the land portion of the tread portion, suppress chipping of the tread portion, and improve the durability performance. It is more preferably 0.35 to 0.65, even more preferably 0.40 to 0.60, and particularly preferably 0.45 to 0.55.
  • L 0 and L 80 are the linear distance (L 0 ) of the groove edge on the tread surface portion of the tread circumferential groove of the tire mounted on the regular rim, the internal pressure is 250 kPa, and the groove It refers to the minimum distance (L 80 ) between the groove walls at the depth of 80%. Simply put, it is the width of the rim that is the distance between the beads of a section cut out of the tire with a width of 2 to 4 cm in the radial direction. It can be obtained by pressing them together.
  • the tread portion preferably has a plurality of circumferential grooves, and the total cross-sectional area of the plurality of circumferential grooves is preferably 10 to 30% of the cross-sectional area of the tread portion.
  • the movement of the tread portion can be suppressed, chipping of the tread portion can be suppressed, and durability performance can be improved. It is more preferably 15 to 27%, even more preferably 18 to 25%, and particularly preferably 21 to 23%.
  • the above-mentioned cross-sectional area of the circumferential groove is the area formed by the straight line connecting the ends of the tread circumferential groove and the groove wall in a tire mounted on a regular rim, having an internal pressure of 250 kPa and being in an unloaded state. It is the total value of , and can be simply obtained by pressing the bead part of a section cut out from the tire with a width of 2 to 4 cm in the radial direction according to the width of the rim.
  • the tread portion has a plurality of lateral grooves extending in the tire axial direction, and the total volume of the plurality of lateral grooves is 2.0 to 5.0% of the volume of the tread portion. It is believed that this suppresses the movement of the tread portion, suppresses chipping of the tread portion, and improves the durability performance. It is more preferably 2.2 to 4.0%, even more preferably 2.5 to 3.5%, and particularly preferably 2.7 to 3.0%.
  • the above-mentioned volume of the lateral groove refers to the total volume formed by the surfaces connecting the ends of the lateral grooves and the groove walls in a tire mounted on a regular rim, having an internal pressure of 250 kPa and being in an unloaded state.
  • the volume of the tread portion can be calculated by calculating the area of the portion of the tread portion that does not include the lateral grooves from the section, multiplying the result by the outer diameter, and finding the difference between the volume of the lateral grooves and the result. .
  • these lateral grooves should have a ratio of groove width Gw to groove depth Gd (Gw/Gd) of 0.50 to 0.80. It is preferable that a certain lateral groove is included, more preferably 0.53 to 0.77, even more preferably 0.55 to 0.75, and particularly preferably 0.60 to 0.70.
  • the groove width and groove depth of the lateral grooves are the maximum perpendicular to the groove direction among the straight lines connecting the tread surface ends of the lateral grooves in a tire with an internal pressure of 250 kPa and no load. , and the maximum depth of the lateral grooves, which can be simply calculated from the state where the bead portions of a section cut out from the tire with a width of 2 to 4 cm in the radial direction are pressed according to the rim width. .
  • the specific outer diameter Dt (mm) is preferably 515 mm or more, and more preferably 558 mm or more. It is preferably 585 mm or more, more preferably 658 mm or more, and most preferably 673 mm or more. On the other hand, it is preferably less than 843 mm, more preferably less than 725 mm, even more preferably less than 707 mm, particularly preferably less than 685 mm, and most preferably less than 655 mm.
  • a specific cross-sectional width Wt (mm) is, for example, preferably 115 mm or more, more preferably 130 mm or more, even more preferably 150 mm or more, even more preferably 170 mm or more, and 185 mm. 193 mm or more is particularly preferable, and 193 mm or more is most preferable. On the other hand, it is preferably less than 305 mm, more preferably less than 245 mm, even more preferably less than 210 mm, particularly preferably less than 205 mm, and most preferably less than 200 mm.
  • a specific cross-sectional height Ht (mm) is, for example, preferably 37 mm or more, more preferably 87 mm or more, and even more preferably 95 mm or more. On the other hand, it is preferably less than 180 mm, more preferably less than 112 mm, and even more preferably less than 101 mm.
  • a specific virtual volume V for example, it is preferably 13,000,000 mm 3 or more, more preferably 29,000,000 mm 3 or more, and further preferably 36,000,000 mm 3 or more. preferable. On the other hand, it is preferably less than 66,000,000 mm 3 , more preferably less than 44,000,000 mm 3 , even more preferably less than 38,800,000 mm 3 .
  • (Dt ⁇ 2 ⁇ Ht) is preferably 450 (mm) or more, more preferably 470 (mm) or more, and 480 (mm) or more. (mm) or more is more preferable.
  • deformation of the tread portion it is preferably less than 560 (mm), more preferably less than 530 (mm), and even more preferably less than 510 (mm).
  • the first rubber composition constituting the groove bottom in the present invention was measured under the conditions of a temperature of 0°C, a frequency of 10 Hz, an initial strain of 10%, and a dynamic strain rate of 2.5%.
  • the loss tangent (tan ⁇ at 0°C) is preferably 0.72 or more. As a result, the effect of the present invention of improving crack resistance and durability can be fully exhibited. It is more preferably 0.75 or more, and even more preferably 0.78 or more.
  • the loss tangent (0°C tan ⁇ ) described above can be measured, for example, using a viscoelasticity measuring device "Iplexer (registered trademark)" manufactured by GABO.
  • the ratio 0°C tan ⁇ /Gd between the 0°C tan ⁇ and the groove bottom thickness (tire radial distance from the groove bottom surface to the cord layer) Gd (mm) is preferably 0.16 or less. As a result, the effect of the present invention of improving crack resistance and durability can be fully exhibited. It is more preferably 0.14 or less, and even more preferably 0.12 or less.
  • the groove bottom portion referred to here may be the groove bottom portion of any circumferential groove, but at least the groove bottom portion of the circumferential groove having the largest groove bottom width (the length in the tire width direction) is the above-mentioned groove bottom portion. It is preferable that the relationship is satisfied, and it is more preferable that the groove bottoms of all the circumferential grooves satisfy the above relationship.
  • Rubber composition forming the tread portion of the tire according to the present invention includes various compounding materials such as a rubber component, a filler, a softening agent, a vulcanizing agent, and a vulcanization accelerator described below.
  • a rubber component such as a rubber component, a filler, a softening agent, a vulcanizing agent, and a vulcanization accelerator described below.
  • the rubber component includes styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR) including natural rubber (NR), nitrile rubber (NBR), and the like. Rubbers (polymers) commonly used in the manufacture of tires can be used. If these rubbers (polymers) are used, (E1-E2) ⁇ 20, preferably (E1-E2) ⁇ 19, more preferably (E1-E2) ⁇ 18, regardless of the type of rubber component. More preferably, by satisfying (E1 ⁇ E2) ⁇ 17, and further satisfying (Equation 1) and (Equation 2), the crack resistance performance and durability performance of the pneumatic tire can be improved.
  • SBR styrene-butadiene rubber
  • BR butadiene rubber
  • IR isoprene rubber
  • NR natural rubber
  • NBR nitrile rubber
  • Rubbers (polymers) commonly used in the manufacture of tires can be used. If these rubbers (polymers) are used,
  • the diene rubber includes IR, SBR, BR, NBR, including natural rubber (NR), and modified versions thereof, and one selected from these may be used alone or Blends of two or more can also be used.
  • NR natural rubber
  • diene rubbers it is particularly preferable to use SBR and BR.
  • the SBR content in 100 parts by mass of the rubber component is preferably 60 parts by mass or more, more preferably 70 parts by mass or more, and even more preferably 80 parts by mass or more. On the other hand, it is preferably 100 parts by mass or less, more preferably 95 parts by mass or less.
  • the weight average molecular weight of SBR is, for example, more than 100,000 and less than 2,000,000.
  • the styrene content of SBR is at least 5% by weight, in particular at least 8% by weight. Also, it is preferably less than 35% by mass, more preferably less than 25% by mass, and even more preferably less than 15% by mass.
  • the vinyl bond content (1,2-bonded butadiene unit content) of SBR is, for example, more than 5% by mass and less than 70% by mass.
  • the structural identification of SBR (measurement of styrene content and vinyl bond content) can be performed using, for example, JNM-ECA series equipment manufactured by JEOL Ltd.
  • the SBR is not particularly limited, and for example, emulsion-polymerized styrene-butadiene rubber (E-SBR), solution-polymerized styrene-butadiene rubber (S-SBR), etc. can be used.
  • SBR may be either unmodified SBR or modified SBR, and these may be used alone or in combination of two or more.
  • the modified SBR may be an SBR having a functional group that interacts with a filler such as silica.
  • SBR end-modified SBR having the above functional group at the end
  • main chain-modified SBR having the above-mentioned functional group in the main chain
  • main chain end-modified SBR having the above-mentioned functional group in the main chain and end for example, the main chain Main chain end-modified SBR having the above functional group and at least one end modified with the above modifier
  • Examples of the functional groups include amino group, amido group, silyl group, alkoxysilyl group, isocyanate group, imino group, imidazole group, urea group, ether group, carbonyl group, oxycarbonyl group, mercapto group, sulfide group, disulfide group, sulfonyl group, sulfinyl group, thiocarbonyl group, ammonium group, imide group, hydrazo group, azo group, diazo group, carboxyl group, nitrile group, pyridyl group, alkoxy group, hydroxyl group, oxy group, epoxy group and the like. .
  • these functional groups may have a substituent.
  • modified SBR for example, SBR modified with a compound (modifying agent) represented by the following formula can be used.
  • R 1 , R 2 and R 3 are the same or different and represent an alkyl group, alkoxy group, silyloxy group, acetal group, carboxyl group (--COOH), mercapto group (--SH) or derivatives thereof.
  • R4 and R5 are the same or different and represent a hydrogen atom or an alkyl group. R4 and R5 may combine to form a ring structure with the nitrogen atom. n represents an integer.
  • modified SBR modified with the compound (modifying agent) represented by the above formula an SBR whose polymer terminal (active terminal) has been modified with the compound represented by the above formula can be used.
  • R 1 , R 2 and R 3 are preferably alkoxy groups, more preferably alkoxy groups having 1 to 8 carbon atoms, still more preferably alkoxy groups having 1 to 4 carbon atoms.
  • R 4 and R 5 are preferably alkyl groups, more preferably alkyl groups having 1 to 3 carbon atoms. n is preferably 1-5, more preferably 2-4, even more preferably 3. Also, when R 4 and R 5 combine to form a ring structure with a nitrogen atom, it is preferably a 4- to 8-membered ring.
  • the alkoxy group also includes a cycloalkoxy group (cyclohexyloxy group, etc.) and an aryloxy group (phenoxy group, benzyloxy group, etc.).
  • the modifier include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane, 2-diethylaminoethyltrimethoxysilane, methoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, 3-diethylaminopropyltriethoxysilane and the like. These may be used alone or in combination of two or more.
  • Modifiers include, for example, polyglycidyl ethers of polyhydric alcohols such as ethylene glycol diglycidyl ether, glycerin triglycidyl ether, trimethylolethane triglycidyl ether, trimethylolpropane triglycidyl ether; polyglycidyl ethers of aromatic compounds having a phenol group of; 1,4-diglycidylbenzene, 1,3,5-triglycidylbenzene, polyepoxy compounds such as polyepoxidized liquid polybutadiene; 4,4'-diglycidyl-diphenyl epoxy group-containing tertiary amines such as methylamine and 4,4'-diglycidyl-dibenzylmethylamine; diglycidylaniline, N,N'-diglycidyl-4-glycidyloxyaniline, diglycidy
  • SBR for example, SBR manufactured and sold by Sumitomo Chemical Co., Ltd., JSR Co., Ltd., Asahi Kasei Co., Ltd., Nippon Zeon Co., Ltd., etc. can be used.
  • SBR may be used independently and may be used in combination of 2 or more types.
  • BR The content of BR in 100 parts by mass of the rubber component is preferably 5 parts by mass or more and 15 parts by mass or less.
  • the weight average molecular weight of BR is, for example, more than 100,000 and less than 2,000,000.
  • the vinyl bond content of BR is, for example, more than 1% by mass and less than 30% by mass.
  • the cis content of BR is, for example, greater than 1 wt% and less than 98 wt%.
  • the trans amount of BR is, for example, more than 1% by mass and less than 60% by mass.
  • the cis content can be measured by infrared absorption spectrometry.
  • BR is not particularly limited, and BR with high cis content (90% or more of cis content), BR with low cis content, BR containing syndiotactic polybutadiene crystals, and the like can be used.
  • BR may be either non-modified BR or modified BR, and modified BR includes modified BR into which the aforementioned functional groups have been introduced. These may be used alone or in combination of two or more.
  • the cis content can be measured by infrared absorption spectrometry.
  • As BR for example, products of Ube Industries, Ltd., JSR Corporation, Asahi Kasei Corporation, Zeon Corporation, etc. can be used.
  • the rubber composition preferably contains a filler.
  • a filler include, for example, silica, carbon black, calcium carbonate, talc, alumina, clay, aluminum hydroxide, and mica.
  • silica and carbon black are preferably used as reinforcing agents.
  • silica it is preferable to use together with a silane coupling agent.
  • the rubber composition preferably contains silica as a filling reinforcing agent.
  • the BET specific surface area of silica is preferably more than 140 m 2 /g, more preferably more than 160 m 2 /g, from the viewpoint of obtaining good durability performance. On the other hand, it is preferably less than 250 m 2 /g, more preferably less than 220 m 2 /g, from the viewpoint of obtaining good rolling resistance during high-speed running.
  • the BET specific surface area mentioned above is the value of N 2 SA measured by the BET method according to ASTM D3037-93.
  • the content of silica with respect to 100 parts by mass of the rubber component is preferably 40 parts by mass or more, more preferably 60 parts by mass or more, and more preferably 80 parts by mass or more. More preferred. On the other hand, it is preferably 200 parts by mass or less, more preferably 150 parts by mass or less, and even more preferably 120 parts by mass or less.
  • the amount of AE is increased or decreased in contrast to the increase or decrease of the content of silica, so the content is appropriately adjusted according to the desired amount of AE.
  • silica examples include dry silica (anhydrous silica) and wet silica (hydrous silica). Among them, wet-process silica is preferable because it has many silanol groups.
  • silica for example, products of Degussa, Rhodia, Tosoh Silica, Solvay Japan, Tokuyama, etc. can be used.
  • the rubber composition preferably contains a silane coupling agent together with silica.
  • the silane coupling agent is not particularly limited, and examples thereof include bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetrasulfide, Bis (3-trimethoxysilylpropyl) tetrasulfide, bis (2-trimethoxysilylethyl) tetrasulfide, bis (2-triethoxysilylethyl) trisulfide, bis (4-trimethoxysilylbutyl) trisulfide, bis ( 3-triethoxysilylpropyl) disulfide, bis(2-triethoxysilylethyl) disulfide, bis(4-triethoxysilylbutyl) disulfide, bis
  • silane coupling agent for example, products of Degussa, Momentive, Shin-Etsu Silicone Co., Ltd., Tokyo Chemical Industry Co., Ltd., Azumax Co., Ltd., Dow Corning Toray Co., Ltd., etc. can be used.
  • the content of the silane coupling agent is, for example, more than 3 parts by mass and less than 25 parts by mass with respect to 100 parts by mass of silica.
  • the rubber composition preferably contains carbon black.
  • the content of carbon black is, for example, more than 1 part by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
  • the amount of AE is increased or decreased in contrast to the increase or decrease of the content of carbon black, so the content is appropriately adjusted according to the desired amount of AE.
  • Carbon black is not particularly limited, furnace black (furnace carbon black) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF and ECF; acetylene black (acetylene carbon black) thermal blacks (thermal carbon blacks) such as FT and MT; channel blacks (channel carbon blacks) such as EPC, MPC and CC; graphite and the like. These may be used individually by 1 type, and may use 2 or more types together.
  • the nitrogen adsorption specific surface area (N 2 SA) of carbon black is, for example, more than 30 m 2 /g and less than 250 m 2 /g.
  • Carbon black has a dibutyl phthalate (DBP) absorption of, for example, greater than 50 ml/100 g and less than 250 ml/100 g.
  • DBP dibutyl phthalate
  • Specific carbon blacks are not particularly limited, and include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, N762 and the like.
  • Commercially available products include Asahi Carbon Co., Ltd., Cabot Japan Co., Ltd., Tokai Carbon Co., Ltd., Mitsubishi Chemical Co., Ltd., Lion Corporation, Shin Nikka Carbon Co., Ltd., Columbia Carbon Co., Ltd., etc. can be used. These may be used alone or in combination of two or more.
  • the rubber composition may contain fillers commonly used in the tire industry, such as calcium carbonate, talc, alumina, clay, aluminum hydroxide, and mica. You may further contain fillers, such as. These contents are, for example, more than 0.1 parts by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
  • the rubber composition may contain oil (including extender oil), liquid rubber, or the like as a softener.
  • oil including extender oil
  • the total content of these components is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and even more preferably 25 parts by mass or more with respect to 100 parts by mass of the rubber component. Also, it is preferably 100 parts by mass or less, more preferably 60 parts by mass or less, and even more preferably 40 parts by mass or less.
  • the content of oil also includes the amount of oil contained in the rubber (oil-extended rubber).
  • the AE content since the AE content also increases or decreases in accordance with the increase or decrease in the content of the softener, the content is appropriately adjusted according to the desired AE content.
  • Oils include, for example, mineral oils (generally referred to as process oils), vegetable oils, or mixtures thereof.
  • mineral oil for example, paraffinic process oil, aromatic process oil, naphthenic process oil and the like can be used.
  • Vegetable oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, rosin, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, Olive oil, sunflower oil, palm kernel oil, camellia oil, jojoba oil, macadamia nut oil, tung oil and the like.
  • Specific process oils include, for example, Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo Co., Ltd., Japan Energy Co., Ltd., Orisoi Co., Ltd., H & R Co., Ltd., Toyokuni Oil Mills Co., Ltd., Showa Shell Sekiyu ( Co., Ltd., Fuji Kosan Co., Ltd., etc. can be used.
  • the liquid rubber mentioned as a softening agent is a polymer that is in a liquid state at room temperature (25°C), and is a polymer whose constituent elements are monomers similar to those of solid rubber.
  • liquid rubbers include farnesene-based polymers, liquid diene-based polymers, hydrogenated products thereof, and the like.
  • a farnesene-based polymer is a polymer obtained by polymerizing farnesene, and has structural units based on farnesene.
  • Farnesene includes ⁇ -farnesene ((3E,7E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene) and ⁇ -farnesene (7,11-dimethyl-3-methylene-1 , 6,10-dodecatriene).
  • the farnesene-based polymer may be a farnesene homopolymer (farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (farnesene-vinyl monomer copolymer).
  • Liquid diene-based polymers include liquid styrene-butadiene copolymer (liquid SBR), liquid butadiene polymer (liquid BR), liquid isoprene polymer (liquid IR), liquid styrene-isoprene copolymer (liquid SIR), and the like. be done.
  • the liquid diene-based polymer has a polystyrene equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of, for example, more than 1.0 ⁇ 10 3 and less than 2.0 ⁇ 10 5 .
  • Mw of a liquid diene polymer is a polystyrene conversion value measured by gel permeation chromatography (GPC).
  • the content of the liquid polymer (the total content of the liquid farnesene-based polymer, the liquid diene-based polymer, etc.) is, for example, more than 1 part by mass and less than 100 parts by mass with respect to 100 parts by mass of the rubber component.
  • liquid rubber for example, products of Kuraray Co., Ltd., Clay Valley, etc. can be used.
  • the rubber composition preferably contains a resin component as necessary.
  • the resin component may be solid or liquid at room temperature.
  • Specific resin components include styrene resins, coumarone resins, terpene resins, C5 resins, C9 resins, C5C9 resins, and acrylic resins. Resins such as resins may be mentioned, and two or more of them may be used in combination.
  • the content of the resin component is preferably more than 20 parts by mass, more preferably more than 30 parts by mass, with respect to 100 parts by mass of the rubber component. Moreover, less than 70 mass parts is preferable and less than 50 mass parts is more preferable.
  • the amount of AE is increased or decreased according to the increase or decrease of the content of the resin component, so the content is appropriately adjusted according to the desired amount of AE.
  • a styrene-based resin is a polymer using a styrene-based monomer as a constituent monomer, and examples thereof include polymers polymerized with a styrene-based monomer as a main component (50% by mass or more).
  • styrene monomers styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, ⁇ -methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-Chlorostyrene, m-chlorostyrene, p-chlorostyrene, etc.), homopolymers obtained by polymerizing each alone, copolymers obtained by copolymerizing two or more styrene monomers, and styrene monomers and copolymers of other monomers copolymerizable therewith.
  • styrene monomers styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, ⁇ -methylstyrene, p-methoxyst
  • Examples of the other monomers include acrylonitrile and methacrylonitrile, acrylics, unsaturated carboxylic acids such as methacrylic acid, unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate, chloroprene, and butadiene.
  • Examples include dienes such as isoprene, olefins such as 1-butene and 1-pentene, ⁇ , ⁇ -unsaturated carboxylic acids such as maleic anhydride, and acid anhydrides thereof.
  • a coumarone-indene resin is a resin containing coumarone and indene as monomer components constituting the skeleton (main chain) of the resin.
  • monomer components contained in the skeleton other than coumarone and indene include styrene, ⁇ -methylstyrene, methylindene, and vinyltoluene.
  • the content of the coumarone-indene resin is, for example, more than 1.0 parts by mass and less than 50.0 parts by mass with respect to 100 parts by mass of the rubber component.
  • the hydroxyl value (OH value) of the coumarone-indene resin is, for example, more than 15 mgKOH/g and less than 150 mgKOH/g.
  • the OH value is the amount of potassium hydroxide required to neutralize the acetic acid bound to the hydroxyl group when acetylating 1 g of the resin, expressed in milligrams, and is determined by the potentiometric titration method (JIS K 0070: 1992).
  • the softening point of the coumarone-indene resin is, for example, more than 30°C and less than 160°C.
  • the softening point is the temperature at which the ball descends when the softening point specified in JIS K 6220-1:2001 is measured with a ring and ball type softening point measuring device.
  • terpene-based resins include polyterpene, terpenephenol, and aromatic modified terpene resins.
  • Polyterpenes are resins obtained by polymerizing terpene compounds and hydrogenated products thereof.
  • Terpene compounds are hydrocarbons represented by the composition (C 5 H 8 ) n and their oxygen-containing derivatives, such as monoterpene (C 10 H 16 ), sesquiterpene (C 15 H 24 ), diterpene (C 20 H 32 ) and the like, which are compounds having a terpene as a basic skeleton, such as ⁇ -pinene, ⁇ -pinene, dipentene, limonene, myrcene, alloocimene, ocimene, ⁇ -phellandrene, ⁇ -terpinene, ⁇ -terpinene, terpinolene , 1,8-cineole, 1,4-cineole, ⁇ -terpineol, ⁇ -terpin
  • polyterpenes examples include terpene resins such as ⁇ -pinene resin, ⁇ -pinene resin, limonene resin, dipentene resin, ⁇ -pinene/limonene resin made from the above-described terpene compounds, and hydrogen obtained by hydrogenating the terpene resin.
  • Additive terpene resins are also included.
  • terpene phenols include resins obtained by copolymerizing the above terpene compounds and phenolic compounds, and resins obtained by hydrogenating the above resins. Specifically, the above terpene compounds, phenolic compounds and formalin are condensed. resin.
  • phenolic compounds include phenol, bisphenol A, cresol, and xylenol.
  • aromatic modified terpene resins include resins obtained by modifying terpene resins with aromatic compounds, and resins obtained by hydrogenating the resins.
  • the aromatic compound is not particularly limited as long as it is a compound having an aromatic ring. Examples include phenol compounds such as phenol, alkylphenol, alkoxyphenol, unsaturated hydrocarbon group-containing phenol; naphthol compounds such as unsaturated hydrocarbon group-containing naphthol; styrene derivatives such as styrene, alkylstyrene, alkoxystyrene, unsaturated hydrocarbon group-containing styrene; coumarone, indene, and the like.
  • C5 resin refers to a resin obtained by polymerizing a C5 fraction.
  • C5 fractions include petroleum fractions having 4 to 5 carbon atoms such as cyclopentadiene, pentene, pentadiene and isoprene.
  • Dicyclopentadiene resin DCPD resin
  • DCPD resin Dicyclopentadiene resin
  • C9 resin refers to a resin obtained by polymerizing a C9 fraction, and may be hydrogenated or modified.
  • C9 fractions include petroleum fractions having 8 to 10 carbon atoms such as vinyltoluene, alkylstyrene, indene, and methylindene.
  • coumarone-indene resin, coumarone resin, indene resin, and aromatic vinyl resin are preferably used.
  • aromatic vinyl resin ⁇ -methylstyrene, homopolymers of styrene, or copolymers of ⁇ -methylstyrene and styrene are preferable because they are economical, easy to process, and have excellent heat build-up properties. , a copolymer of ⁇ -methylstyrene and styrene is more preferred.
  • the aromatic vinyl resin for example, those commercially available from Kraton Co., Eastman Chemical Co., etc. can be used.
  • C5C9 resin refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be hydrogenated or modified.
  • the C5 and C9 fractions include the petroleum fractions described above.
  • the C5C9 resin for example, those commercially available from Tosoh Corporation, LUHUA, etc. can be used.
  • acrylic resin is not particularly limited, for example, a solvent-free acrylic resin can be used.
  • Solvent-free acrylic resin can be produced by a high-temperature continuous polymerization method (high-temperature continuous bulk polymerization method) (U.S. Pat. No. 4,414,370) without using auxiliary materials such as polymerization initiators, chain transfer agents, organic solvents, etc. as much as possible.
  • high-temperature continuous bulk polymerization method U.S. Pat. No. 4,414,370
  • auxiliary materials such as polymerization initiators, chain transfer agents, organic solvents, etc.
  • (meth)acryl means methacryl and acryl.
  • Examples of monomer components constituting the acrylic resin include (meth)acrylic acid, (meth)acrylic acid esters (alkyl esters, aryl esters, aralkyl esters, etc.), (meth)acrylamides, and (meth)acrylamide derivatives.
  • (Meth)acrylic acid derivatives such as
  • styrene In addition to (meth)acrylic acid and (meth)acrylic acid derivatives, styrene, ⁇ -methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene, divinylnaphthalene, etc., may be used as monomer components constituting the acrylic resin. of aromatic vinyls may be used.
  • the above acrylic resin may be a resin composed only of a (meth)acrylic component, or a resin containing components other than the (meth)acrylic component as constituent elements. Moreover, the acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.
  • resin components include Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals, BASF, Arizona Chemical, Nichinuri Chemical Co., Ltd. ) Nippon Shokubai Co., JX Energy Co., Ltd., Arakawa Chemical Industries Co., Ltd., Taoka Chemical Co., Ltd., and other products can be used.
  • the rubber composition preferably contains an antiaging agent.
  • the content of the antioxidant is, for example, more than 1 part by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component.
  • anti-aging agents examples include naphthylamine-based anti-aging agents such as phenyl- ⁇ -naphthylamine; diphenylamine-based anti-aging agents such as octylated diphenylamine and 4,4′-bis( ⁇ , ⁇ ′-dimethylbenzyl)diphenylamine; -Isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, N,N'-di-2-naphthyl-p-phenylenediamine, etc.
  • naphthylamine-based anti-aging agents such as phenyl- ⁇ -naphthylamine
  • diphenylamine-based anti-aging agents such as octylated diphenylamine and 4,4′-bis( ⁇ , ⁇ ′-dimethylbenzyl)diphenylamine
  • p-phenylenediamine-based antioxidants such as polymers of 2,2,4-trimethyl-1,2-dihydroquinoline; 2,6-di-t-butyl-4-methylphenol, monophenolic anti-aging agents such as styrenated phenol; inhibitors and the like. These may be used alone or in combination of two or more.
  • anti-aging agent for example, products of Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industry Co., Ltd., Flexis, etc. can be used.
  • the rubber composition may contain stearic acid.
  • the content of stearic acid is, for example, more than 0.5 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
  • Conventionally known stearic acid can be used, for example, products of NOF Corporation, NOF, Kao Corporation, Fuji Film Wako Pure Chemical Industries, Ltd., Chiba Fatty Acids Co., Ltd. can be used.
  • the rubber composition may contain zinc oxide.
  • the content of zinc oxide is, for example, more than 0.5 parts by mass and less than 10 parts by mass with respect to 100 parts by mass of the rubber component.
  • As the zinc oxide conventionally known ones can be used, for example, products of Mitsui Kinzoku Mining Co., Ltd., Toho Zinc Co., Ltd., Hakusui Tech Co., Ltd., Seido Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc. can be used.
  • Each rubber composition preferably contains a wax.
  • the wax content is, for example, 0.5 to 20 parts by mass, preferably 1.5 to 15 parts by mass, and more preferably 3.0 to 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
  • the wax is not particularly limited, and includes petroleum waxes such as paraffin wax and microcrystalline wax; natural waxes such as plant waxes and animal waxes; synthetic waxes such as polymers of ethylene and propylene. These may be used alone or in combination of two or more.
  • wax for example, products of Ouchi Shinko Kagaku Kogyo Co., Ltd., Nippon Seiro Co., Ltd., Seiko Kagaku Co., Ltd., etc. can be used.
  • the rubber composition preferably contains a cross-linking agent such as sulfur.
  • the content of the cross-linking agent is, for example, more than 0.1 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
  • sulfur examples include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and soluble sulfur, which are commonly used in the rubber industry. These may be used alone or in combination of two or more.
  • sulfur for example, products of Tsurumi Chemical Industry Co., Ltd., Karuizawa Io Co., Ltd., Shikoku Kasei Kogyo Co., Ltd., Flexis Co., Ltd., Nihon Kantan Kogyo Co., Ltd., Hosoi Chemical Industry Co., Ltd., etc. can be used. .
  • cross-linking agents other than sulfur examples include Takkiroru V200 manufactured by Taoka Chemical Co., Ltd., DURALINK HTS (1,6-hexamethylene-sodium dithiosulfate dihydrate) manufactured by Flexis, and KA9188 manufactured by LANXESS.
  • examples include vulcanizing agents containing sulfur atoms such as (1,6-bis(N,N'-dibenzylthiocarbamoyldithio)hexane) and organic peroxides such as dicumyl peroxide.
  • the rubber composition preferably contains a vulcanization accelerator.
  • the content of the vulcanization accelerator is, for example, more than 0.3 parts by mass and less than 10.0 parts by mass with respect to 100 parts by mass of the rubber component.
  • Vulcanization accelerators include thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, and N-cyclohexyl-2-benzothiazylsulfenamide; tetramethylthiuram disulfide (TMTD ), tetrabenzyl thiuram disulfide (TBzTD), tetrakis (2-ethylhexyl) thiuram disulfide (TOT-N) and other thiuram vulcanization accelerators; N-cyclohexyl-2-benzothiazolesulfenamide, Nt-butyl- 2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, N,N'-diisopropyl-2-benzothiazolesulfenamide, etc. and guanidine-based
  • additives generally used in the tire industry such as fatty acid metal salts, carboxylic acid metal salts, organic peroxides, etc.
  • the content of these additives is, for example, more than 0.1 parts by mass and less than 200 parts by mass with respect to 100 parts by mass of the rubber component.
  • the rubber composition is prepared by a general method, for example, a base kneading step of kneading a rubber component and a filler such as silica or carbon black, and a kneaded product obtained in the base kneading step and crosslinked. It is produced by a manufacturing method including a finishing kneading step of kneading the agent.
  • Kneading can be performed, for example, using a known (closed) kneader such as a Banbury mixer, kneader, or open roll.
  • a known (closed) kneader such as a Banbury mixer, kneader, or open roll.
  • the kneading temperature in the base kneading step is, for example, more than 50°C and less than 200°C, and the kneading time is, for example, more than 30 seconds and less than 30 minutes.
  • compounding agents conventionally used in the rubber industry such as softeners such as oil, stearic acid, zinc oxide, anti-aging agents, waxes, vulcanization accelerators, etc. may be added as appropriate and kneaded.
  • the finishing kneading step the kneaded material obtained in the base kneading step and the cross-linking agent are kneaded.
  • the kneading temperature in the finishing kneading step is, for example, above room temperature and below 80° C.
  • the kneading time is, for example, above 1 minute and below 15 minutes.
  • a vulcanization accelerator, zinc oxide, and the like may be appropriately added and kneaded as needed.
  • the first rubber composition or the second rubber composition can be obtained by adjusting the contents of the softener and the resin component.
  • the tire of the present invention is manufactured by a conventional method using the unvulcanized rubber composition obtained through the finish kneading step. Specifically, first, for example, the first rubber composition is molded as a cap rubber that forms the groove bottom, and the second rubber composition is molded as a base rubber adjacent to the radially inner side of the tire. to obtain the tread.
  • an unvulcanized tire is produced by molding by a normal method on a tire molding machine together with other tire members. Specifically, on the molding drum, an inner liner as a member for ensuring the airtightness of the tire, a carcass as a member that withstands the load, impact, and filling air pressure received by the tire, and a strong tightening of the carcass to increase the rigidity of the tread. A belt or the like is wound as a heightening member, both ends of the carcass are fixed on both side edges, and a bead portion is arranged as a member for fixing the tire to the rim. An unvulcanized tire is produced by laminating a tread on the part and a sidewall part as a member that protects the carcass and resists bending on the radially outer side.
  • an inclined belt layer extending at an angle of 15° to 30° with respect to the tire circumferential direction as the belt, thereby ensuring the durability of the tire.
  • the rigidity of the tread can be sufficiently maintained.
  • it since it can be restrained in the circumferential direction, it becomes easy to suppress the growth of the outer diameter.
  • the vulcanization step can be carried out by applying known vulcanization means.
  • the vulcanization temperature is, for example, more than 120° C. and less than 200° C.
  • the vulcanization time is, for example, more than 5 minutes and less than 15 minutes.
  • the tire when the tire is mounted on a regular rim and the internal pressure is set to 250 kPa, the tire is formed into a shape that satisfies the above-mentioned (Equation 1) and (Equation 2).
  • Equation 1 a layer of a sealing material, a sponge material, or an electronic part such as a sensor, which will be described later, is provided in the tire, it is preferable to attach these to the inner surface of the vulcanized tire.
  • Specific tires that can satisfy the above (Formula 1) and (Formula 2) include 145/60R18, 145/60R19, 155/55R18, 155/55R19, 155/70R17, 155/70R19, and 165/55R20. , 165/55R21, 165/60R19, 165/65R19, 165/70R18, 175/55R19, 175/55R20, 175/55R22, 175/60R18, 185/55R19, 185/60R20, 195/50R20, 195/55R20, etc. Tires with size notation are mentioned.
  • (Formula 1) and (Formula 2) are satisfied among tires that can satisfy (Formula 1) and (Formula 2), it is preferably applied to a pneumatic tire for a passenger car, and (Formula 1) and (Formula 2) are satisfied. Therefore, it contributes more preferably to solving the problem of the present invention, which is to provide a pneumatic tire that not only has low rolling resistance and excellent fuel efficiency, but also has sufficiently improved crack resistance and durability. can do.
  • the term "passenger car tire” as used herein refers to a tire that is mounted on a four-wheeled vehicle and has a maximum load capacity of 1000 kg or less.
  • the pneumatic tire of the present invention may have a puncture-preventing sealant layer on the inner peripheral surface of the tread portion, or may have a sponge material adhered to the inner peripheral surface of the sealant layer. good. Further, the pneumatic tire may have an electronic component such as a sensor provided therein.
  • a tread having a two-layer structure is prepared using the first rubber composition as the cap rubber and the second rubber composition as the base rubber, and the second rubber composition is mixed with the first rubber composition.
  • the amount of AE is changed by changing the formulation of the composition, it does not preclude taking other aspects.
  • Compounding materials First, as compounding materials for the first rubber composition, SBR (JSR1502 manufactured by JSR Corporation) 90 parts by mass, BR (UBEPOL BR150B manufactured by Ube Industries, Ltd.) 10 parts by mass, oil ( Process oil A/OMIX manufactured by Sankyo Yuka Kogyo Co., Ltd.) 30 parts by mass, carbon black (Show Black N134 manufactured by Cabot Japan Co., Ltd.) 5 parts by mass, silica (Ultrasil 9100 GR manufactured by Evonik) 100 parts by mass , silane coupling agent (Si363 manufactured by Degussa) 9 parts by weight, resin ( ⁇ -methylstyrene resin manufactured by Kraton) 40 parts by weight, wax (Ozoace 0355 manufactured by Nippon Seiro Co., Ltd.) 1.5 parts by weight , stearic acid (NOF Co., Ltd.
  • Si363 silane coupling agent
  • resin ⁇ -methylstyrene resin manufactured by Kraton
  • wax
  • stearic acid "Tsubaki" 2 parts by mass, zinc oxide (Mitsui Kinzoku Co., Ltd. Zinc Flower No. 1) 2 parts by mass, anti-aging agent (Ouchi Shinko Chemical Industry Co., Ltd. ) Nocrack 6C) 1 part by mass, vulcanization accelerator (Ouchi Shinko Kagaku Kogyo Co., Ltd. Noccellar CZ-G (CZ)) 1 part by mass, vulcanization accelerator (Ouchi Shinko Kagaku Kogyo Co., Ltd. 1 part by mass of Noxcellar D (DPG) manufactured by Tsurumi Kagaku Kogyo Co., Ltd. and 2 parts by mass of sulfur (powder sulfur manufactured by Tsurumi Chemical Industry Co., Ltd.) were prepared.
  • DPG Noxcellar D
  • sulfur sulfur manufactured by Tsurumi Chemical Industry Co., Ltd.
  • the same compounding material as for the first rubber composition was prepared. However, the blending amounts of oil, resin, silica, and carbon black were adjusted so that the AE amount was different from that of the first rubber composition.
  • the first rubber composition is used as a cap rubber
  • the second rubber composition is used as a base rubber.
  • a tread with a two-layer structure was produced, laminated together with other tire members to form an unvulcanized tire, press-vulcanized for 10 minutes under conditions of 170 ° C., and a size of 175 type for each test Tires (Examples 1-1 to 1-5 and Comparative Examples 1-1 to 1-5) were manufactured.
  • test pieces were cut out from both the cap layer and the base layer of the tread portion of each test tire, and the AE amount (E1, E2) was measured for each test piece in accordance with JIS K 6229:2015. E1-E2) was determined (E1: 26% by mass). Results are shown in Tables 1 and 2.
  • each test piece cut out from the cap layer was measured using a viscoelasticity measuring device "Iplexer (registered trademark)" manufactured by GABO Co., Ltd. at a temperature of 0 ° C., a frequency of 10 Hz, an initial strain of 10%, and a dynamic strain rate of 2.5%.
  • Iplexer registered trademark
  • each test tire was mounted on all wheels of a vehicle (domestic FF vehicle, displacement 2000cc), and after filling air so that the internal pressure was 250kPa, the tire was run on a dry road test course, After making 10 km laps at a speed of 100 km/h, the accelerator was released, and the distance from when the accelerator was turned off until the vehicle stopped was measured as the rolling resistance during high-speed running. The larger the value, the longer the distance from when the accelerator is released until the vehicle stops, and the smaller the rolling resistance in the steady state.
  • Example 4-3 As 100, it was indexed based on the following formula to evaluate fuel efficiency. The larger the value, the smaller the rolling resistance in the steady state and the better the fuel efficiency. Table 7 shows the evaluation results.
  • Low fuel consumption performance [(Measurement result of test tire) / (Measurement result of Example 4-3)] ⁇ 100
  • tread rubber composition 2 instead of 90 parts by mass of SBR and 10 parts by mass of BR, 60 parts by mass of SBR (JSR1502 manufactured by JSR Corporation), 20 parts by mass of NR (RSS#3) and 20 parts by mass of BR (UBEPOL BR150B manufactured by Ube Industries, Ltd.)
  • a first rubber composition used for producing a test tire in Experiment 5 was obtained under the same conditions as in Production 1 of the tread rubber composition, except for using .
  • 100 parts by mass of NR (RSS #3) was used, and the amount of AE was different from that of the first rubber composition.
  • a second rubber composition used for producing a test tire in Experiment 5 was obtained under the same conditions and conditions as in the production of the tread rubber composition 1 above, except that the amount of (1) was adjusted.
  • Example 5 Using the first rubber composition and the second rubber composition produced in Production 2 of the tread rubber composition, in the same manner as in Experiment 1, Example 5 and Comparative Example 5 having the sizes shown in Table 8 were prepared. After manufacturing each test tire, each parameter was determined in the same manner as in Experiment 1, and performance evaluation tests were performed in the same manner to evaluate. In addition, in this experiment, the result in the comparative example 5 was made into 100, and it evaluated. Table 8 shows the results of each evaluation.
  • tread rubber composition 3 Instead of 90 parts by mass of SBR and 10 parts by mass of BR, 50 parts by mass of NR (RSS #3) and 50 parts by mass of BR (UBEPOL BR150B manufactured by Ube Industries, Ltd.) A first rubber composition used for manufacturing test tires in Experiment 6 was obtained under the same conditions as in Production 1.
  • the first rubber composition is an AE amount
  • the blending amounts of oil, resin, silica, and carbon black were adjusted so that the tread rubber composition was different, it was used to manufacture a test tire for Experiment 6 under the same conditions as in Production 1 of the tread rubber composition.
  • a second rubber composition was obtained.
  • Example 6 Using the first rubber composition and the second rubber composition produced in Production 3 of the tread rubber composition, in the same manner as in Experiment 1, the rubber compositions of Example 6 and Comparative Example 6 having the sizes shown in Table 8 were prepared. After manufacturing each test tire, each parameter was determined in the same manner as in Experiment 1, and performance evaluation tests were performed in the same manner to evaluate. In addition, in this experiment, the result in the comparative example 6 was made into 100, and it evaluated. Table 8 shows the results of each evaluation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

La présente invention concerne un pneumatique qui présente des performances de résistance aux fissures et des performances de durabilité sensiblement améliorées.　Selon la présente invention, un pneumatique a une partie bande de roulement qui a des rainures dans sa surface et comprend une première composition de caoutchouc qui forme les parties inférieures des rainures et une seconde composition de caoutchouc qui est adjacente à la première composition de caoutchouc plus à l'intérieur dans la direction radiale du pneu que les parties inférieures des rainures. Lorsque la fraction extractible à l'acétone de la première composition de caoutchouc et la fraction extractible à l'acétone de la seconde composition de caoutchouc sont, respectivement, E1 % en masse et E2 % en masse, (E1-E2)<20, et lorsque la largeur en coupe transversale du pneu, le diamètre externe du pneu, et le volume de l'espace occupé par le pneu lorsque le pneu est monté sur une jante standard à une pression interne de 250 kPa sont, respectivement, Wt (mm), Dt (mm) et un volume virtuel V (mm3), le pneu satisfait l'expression (1) et l'expression (2).　(1) 1700≤(Dt2×π/4)/Wt≤2827,4 (2) [(V+1,5×107)/Wt]≤2,88×105
PCT/JP2021/032035 2021-09-01 2021-09-01 Pneumatique WO2023032062A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21955952.3A EP4382315A1 (fr) 2021-09-01 2021-09-01 Pneumatique
PCT/JP2021/032035 WO2023032062A1 (fr) 2021-09-01 2021-09-01 Pneumatique
CN202180101784.5A CN117858809A (zh) 2021-09-01 2021-09-01 充气轮胎

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/032035 WO2023032062A1 (fr) 2021-09-01 2021-09-01 Pneumatique

Publications (1)

Publication Number Publication Date
WO2023032062A1 true WO2023032062A1 (fr) 2023-03-09

Family

ID=85410959

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/032035 WO2023032062A1 (fr) 2021-09-01 2021-09-01 Pneumatique

Country Status (3)

Country Link
EP (1) EP4382315A1 (fr)
CN (1) CN117858809A (fr)
WO (1) WO2023032062A1 (fr)

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414370A (en) 1981-01-09 1983-11-08 S. C. Johnson & Son, Inc. Process for continuous bulk copolymerization of vinyl monomers
US5010166A (en) 1987-03-05 1991-04-23 S. C. Johnson & Son, Inc. Process and apparatus for producing polyol polymers and polyol polymers so produced
JP2000309206A (ja) * 1999-04-26 2000-11-07 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2005028999A (ja) * 2003-07-11 2005-02-03 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2005067236A (ja) * 2003-08-25 2005-03-17 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2007313522A (ja) 2006-05-23 2007-12-06 Nissan Motor Co Ltd プレス型およびプレス加工方法
JP2016113051A (ja) * 2014-12-16 2016-06-23 住友ゴム工業株式会社 空気入りタイヤ
JP2017218042A (ja) * 2016-06-08 2017-12-14 住友ゴム工業株式会社 空気入りタイヤ
WO2018186367A1 (fr) 2017-04-06 2018-10-11 株式会社ブリヂストン Composition de caoutchouc et pneu
JP2018178034A (ja) 2017-04-19 2018-11-15 株式会社ブリヂストン ゴム組成物およびそれを用いたタイヤ
JP2019089911A (ja) 2017-11-13 2019-06-13 株式会社ブリヂストン タイヤ用ゴム組成物およびタイヤ
JP2019206643A (ja) 2018-05-29 2019-12-05 横浜ゴム株式会社 タイヤ用ゴム組成物の製造方法
JP2020023640A (ja) * 2018-08-08 2020-02-13 住友ゴム工業株式会社 トレッド用ゴム組成物及び空気入りタイヤ
JP2020029146A (ja) * 2018-08-22 2020-02-27 住友ゴム工業株式会社 トレッド用ゴム組成物及び空気入りタイヤ
JP6835284B1 (ja) * 2020-07-28 2021-02-24 住友ゴム工業株式会社 空気入りタイヤ
JP6851579B1 (ja) * 2020-07-28 2021-03-31 住友ゴム工業株式会社 空気入りタイヤ

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414370A (en) 1981-01-09 1983-11-08 S. C. Johnson & Son, Inc. Process for continuous bulk copolymerization of vinyl monomers
US5010166A (en) 1987-03-05 1991-04-23 S. C. Johnson & Son, Inc. Process and apparatus for producing polyol polymers and polyol polymers so produced
JP2000309206A (ja) * 1999-04-26 2000-11-07 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2005028999A (ja) * 2003-07-11 2005-02-03 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2005067236A (ja) * 2003-08-25 2005-03-17 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2007313522A (ja) 2006-05-23 2007-12-06 Nissan Motor Co Ltd プレス型およびプレス加工方法
JP2016113051A (ja) * 2014-12-16 2016-06-23 住友ゴム工業株式会社 空気入りタイヤ
JP2017218042A (ja) * 2016-06-08 2017-12-14 住友ゴム工業株式会社 空気入りタイヤ
WO2018186367A1 (fr) 2017-04-06 2018-10-11 株式会社ブリヂストン Composition de caoutchouc et pneu
JP2018178034A (ja) 2017-04-19 2018-11-15 株式会社ブリヂストン ゴム組成物およびそれを用いたタイヤ
JP2019089911A (ja) 2017-11-13 2019-06-13 株式会社ブリヂストン タイヤ用ゴム組成物およびタイヤ
JP2019206643A (ja) 2018-05-29 2019-12-05 横浜ゴム株式会社 タイヤ用ゴム組成物の製造方法
JP2020023640A (ja) * 2018-08-08 2020-02-13 住友ゴム工業株式会社 トレッド用ゴム組成物及び空気入りタイヤ
JP2020029146A (ja) * 2018-08-22 2020-02-27 住友ゴム工業株式会社 トレッド用ゴム組成物及び空気入りタイヤ
JP6835284B1 (ja) * 2020-07-28 2021-02-24 住友ゴム工業株式会社 空気入りタイヤ
JP6851579B1 (ja) * 2020-07-28 2021-03-31 住友ゴム工業株式会社 空気入りタイヤ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TOA SYNTHETIC RESEARCH ANNUAL REPORT TREND2000, vol. 3, pages 42 - 45

Also Published As

Publication number Publication date
EP4382315A1 (fr) 2024-06-12
CN117858809A (zh) 2024-04-09

Similar Documents

Publication Publication Date Title
JP6800435B1 (ja) 空気入りタイヤ
JP6835284B1 (ja) 空気入りタイヤ
JP7479595B2 (ja) 空気入りタイヤ
JP6699079B1 (ja) 空気入りタイヤ
JP7479594B2 (ja) 空気入りタイヤ
JP6851579B1 (ja) 空気入りタイヤ
JP7278538B1 (ja) タイヤ
JP6945806B1 (ja) 空気入りタイヤ
JP2022089491A (ja) 空気入りタイヤ
WO2023032062A1 (fr) Pneumatique
JP7459448B2 (ja) 空気入りタイヤ
JP7321429B1 (ja) タイヤ
JP2023078762A (ja) 空気入りタイヤ
WO2022050153A1 (fr) Pneumatique
WO2021225060A1 (fr) Pneu à carcasse radiale pour véhicule de tourisme
JP2022105946A (ja) 空気入りタイヤ
JP2023069270A (ja) 空気入りタイヤ
JP2023061490A (ja) 空気入りタイヤ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21955952

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202180101784.5

Country of ref document: CN

ENP Entry into the national phase

Ref document number: 2021955952

Country of ref document: EP

Effective date: 20240307

NENP Non-entry into the national phase

Ref country code: DE